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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30b65547f1b9cb9812f98e89aa5667ed938cdb5cf960db95b7f334ebdd8183ab' 
  AND token = 'ocw0G1LlejUJeZUFtqJqDLvUUjOCk1Tg6Ya65ia5DPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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