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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82ee58b57cf6f5c4316f6e90acf1c62692249e32c4e7dd16819ba3cfb3b943f1' 
  AND token = 'AA3t3FtGaqbQW4E0JDJQXdRXeotV9ulLFMImcLqXSg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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