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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d2df40b17ddf4f0513ec0e970d94237093f11f79b0d46f7792884a5b6cb3c7f' 
  AND token = '0BtEaiK9kSY25383gkyp50Y9IW9K2KmuFvLYbPRbECk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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