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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06001b6c2df8fd1cb7e795905da092934c94388e1b318fce7bb40c091fb273f4' 
  AND token = 'OY1/mnl6FU50a14LbmFB3QAecwCQuBYMJQ6YgR+6gxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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