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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd82c2ac1e2d00212f0c8c16ccd6bd4fc8128716b197fe374abbc8f44e7df0862' 
  AND token = 'Mo09HcPPtDpI0vKvsXq6DsVU/UnQBcjT1TMhk+td/Lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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