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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24ab5e63e3c8f8d6b6737d7136d70f3dc459f414ae9f8b4d24196a8f86d41f2a' 
  AND token = 'z+9BB4ZBCR53ZO3eeOEt0l5lCmsVVW2A+jnMACPtgac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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