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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8415534b9cbb66a68bc0d7c3b666d3c180509c138db2112adc469648cf649b3e' 
  AND token = '9xJSbuDg3xX5+qfGCg44x64aSwXiiEBj5QEM3NS+T+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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