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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd26f4b48206879b2867ae790df010a543eea19c96fb5d8266f4b4b956ddb7da' 
  AND token = 'rUv6JnsLS8mJrvbgw1ijFVGWWw0548wkXhn48S/gMck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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