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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75debe9f2c71a2f91b3143510c5677938a7931da227c964d03b7ad1c0ce56c71' 
  AND token = '1nd3ESyJzYoW/wYvEMPXh1FHzK6/RgsE3m1w7atVrf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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