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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3a37698b81ede637367dbf6d7178527b1f5e6beaa07cf9d4795fd95ecf9e687' 
  AND token = 'Wz3BBopTM67Bz9DdqmOjdTU13XnNqsy7NW+g/q5chRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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