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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb949fa85b1c1a9a9fa9755571f1dd6cfda06bca63c3926cf1a333386dd04457' 
  AND token = 'L1/CPfi5OYBnBqLi7FBQzWN9pReK7lVe4xBraFeMvLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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