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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a79dba31eb6c6957970f67d611283609f35a4669459e348b982dee328e7086c9' 
  AND token = 'oX734P6wdDpPEhZt+G8JTDztdrQvJtsnsnsDcNpANvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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