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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98b3193a2be6debc2783f53f61e315e597c9f328cd12bba75040070610849aa5' 
  AND token = 'f6eMUuGKwdIwh1hQf9iMup6UEsPqvC4ZfZyQxf1dsQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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