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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c84b1c126f74cb1b521b3cd128aa4d4e4314db60c7212a37fc427625a5f5697a' 
  AND token = 'rLkg56tvozfCO+Got74LdQmymnoHS5/FqExqXrsmbF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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