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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '501bdadf3044111c93d44115ca4f2aca284694044092689e9d953bba3f818a49' 
  AND token = 'tK8vqKuu8sKiRb7KT2YK1oDQ8SiGXsNqiiUDAwu66QY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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