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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '996e86047fc700e583cbc12240ec33b52a54895cc2354e95c9e0fe9b09c48e6b' 
  AND token = 'pvlarBo/BjVf/Pr2Mq+LHMpcedT/fpRL0/6pNVUFlPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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