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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a964749de1a1c6ead4ceb73cd60f139e8e7ae2341fa60a7d50c854edcd840d86' 
  AND token = 'Y6iNrVHpmYc95OFNP3hCEgEu1j4BuqJNslXlo7JBEls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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