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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '871bb9626da38ad8203f6c58a238dc210519c2af9143e446df71eaf9f8a4a41f' 
  AND token = '7N07ACmxu/9ZtIOp1pZvvv1s6pWCL7N1aMEAnZjqLyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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