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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '192b04011412dbf3d8d057ed95d54bc2712ec05dbd7e0de5750481321299ae05' 
  AND token = 'pY3FRTSiDvltnnPrKXojxI3Vt6KC8ImjXC1ICS+f0sI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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