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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7f99e37dc54b845b8175a043bf3175ef8790425ce83d23c158a83ae886c05b4' 
  AND token = 'GWaRF39twUGa944A1rDqyOmSaqOB3hluYhrWRdaRIP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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