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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c66d3537073ad2adb9377d947211984908176808b40c70b0f1c45636c18b0902' 
  AND token = 'kc5NQol5ZSKeNfQYhIPcKWMMNzwK4sb6cfICadHpUH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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