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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8d2cd82ddb5584861ed948cc517acbd995f517062aa9093d863be47fe711a4c' 
  AND token = 'AHLR8fff6EW1WPjqEiY6dcBs0CX2Rv4HcmDc1TEAxXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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