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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9edc0ee1e6fd7273113372291823b4e310b6b2a7d518571ac4f2a222c7459b13' 
  AND token = 'XhbjHaIKrTD1l69NK8oMz3mF1jhJvdhLsivx6WCWwbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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