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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f403d75663d9cdc91dd8fcf9abeb07ae6b1e9b399562fde4bacd2ef6bc54d09' 
  AND token = 'GDsATVlkcGR9eUuHgPmCntdsI8gOWmmqFLry/TQT1ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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