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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5e8b683eaa1d3d6e4c65550c9945038348f2dbd6dec8899baf0428712ac03f2' 
  AND token = 'tcf6IwwhcBTZmkUVknPAYubXcDASbRxonimubiUUI4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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