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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8184955a5091affe5a8bb446ab630f573cc399292156a636d5fa8a22e7a68c1' 
  AND token = 'XO7sOgHQTiM8FzqoxoUSBHf7ucIxV6qdIabT1C7D5Ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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