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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1376aafb8876ee4a619cbedbcbb5b95a6668a9541110db78c575e861d54fb8c4' 
  AND token = '63Mqb58Wx528uyuXnb9DM4otalpgzJk/tlqltFKYYyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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