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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efbbb1edcedb98942819757c59aad21cea66b7bd0098a45d266e2316086f5e04' 
  AND token = 'Gbo78C+rslabh/0bHeq4j0p5jBE7eblfjq5QcYc/z6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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