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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eb22ad0db4b6e8f8591898052a98c9db9a08ebc8be33df76001c2a32c71ed4c' 
  AND token = 'loEo0A6b20h/nwYmRt5Llje7VsUfCLedEb6uADEfe34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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