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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6242831ecb0f296b2f181fca1c4a60f5b7ff212b4701aab6c4a7974d2f0c28d3' 
  AND token = 'gyrKeafooVlyvr7L0cRXSxk0zo7Feg4tQH4bVOw8ipY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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