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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '431791e0304364270f496dd22bc42e3d9f7a6c4a6e99bf3a70973dc3a96d7c89' 
  AND token = 'Z3mL8QNpZ2/2bvHqbn0OMvtaBNjDzV2d0DZJ5RaPfrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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