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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a409d71799d5e411b033f140cb9ebcccae5a54f7b0ef642de6e95c065c1cdbde' 
  AND token = 'wstcyc23TicR0CLVm9L7LGLoMVVpk0dx5lRY8rpzG50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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