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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a0e9d03bb91f8042f49cbe7a3e9b5df45c86b14bab34e0dfe8e37f9b600350a' 
  AND token = 'C6xS3MPFXxzVtLzYk4vB5Go+zyIclczi1OUgZ4TsHxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}