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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68c3fd844096642450d9cc876e3b90562969abfb7eaf07a524d123a10105d5fc' 
  AND token = 'cgQt7U2iTC/LXXq4eNnoX2rTcX1W4WZEZlDHyN0gCKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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