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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40555fa03d67cfbeade2b9a3b6e65072e892f658bac50b72da7e25249a30923c' 
  AND token = 'bcyGHjSRavU6zW+1bS3p7JY6lQh5/neexJ2XSI2MDB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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