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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9cea72aaa9b6f62f7eee4c4df9ebc973ae133f2bd61601e9ceafe14b80ab1be' 
  AND token = 'zHcQgWD3f5mtd1HYsYOUMytWGHbEr98souy2e+K5+oM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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