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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9636103fc23edbea4a47aa4f4d01db196fce1d8fc462188dd67b82e5a240a39' 
  AND token = 'LO38Z9jdz1106lPdEasPEJ6pMwHawwahGZ5qWzE/+7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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