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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '284419d15f2d62b4b5d66558b77324abb26edb6c70d31c21cf21606af77e783f' 
  AND token = 'yChURk7j5DfsPyeHkgchHeJgVYm8Xgcs0ExTnzAvsms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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