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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c880c3493bd8210afa856315cf32e9400f72b6593d14c4bc15c4612829172bb' 
  AND token = 'wSdeYw8NFgfXjdtiJiOy9pRO94Sfhob24Vtqr7pgJjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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