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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5421784b99a71628ee7aafb0a6277d10667922bb404a0bb0011f316b1b9b124f' 
  AND token = 'ay0gRaxroOJxrHD1ezNHevg5n5zqgBbY7d2aW9jbPKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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