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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9027512cf2ccbd26cdf0acde828c4a1700b90c294d77688ce3f41277412d8ff7' 
  AND token = 'pIknENdWl2F1ns6L4dXsOx+GVtFqteTjLjV0xwrYo54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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