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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29f3b9157956dccb5c51889991d0f2163fa32c9e6b4ede04fa2ac14ea4e8f194' 
  AND token = 'hpKf/u3zjd50YppQK5MH4sX3e19PZRsZ6aTpvzrOlms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00209

JSON explain

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