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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f8a6179c037b6bf38d0be30a81fe9883d0a5ccd97bd07ff18113079cd9775e4' 
  AND token = 'Gnvtds80nA+tQDk434Iw5pLwzFRFxGos5uHuXUG/aqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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