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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b389ffcac30ef21b4f00c78bc046c37ad65806ff971aab51274c93fccc45e48' 
  AND token = 'J9Rpkq35CEgaKAKs7oXI/cnvLUKopZZ/iIfqqNsTQyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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