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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7630362152b7933f892ca5b23dc511c2d83ee95bc2fa60fa855bb9d382b2e34' 
  AND token = 'Zu4ydzmQVZbVcNRQmr60odfZi14rEAbvkCJ+FRGfOQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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