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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0711373aded26379f9b14ede0b7f42e6f09c9efb971a241da49c5ef94a31d61' 
  AND token = '+g4zuZJDRMDbDBd8sbN57GCSvFPsuH34T87BFPzKH7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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