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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ad4ab320bf4007b0395e7a878379b2701fe44b9db0e7155751b861ddc03af94' 
  AND token = 'aNCqHWOSqKX32zEbxWAAZrbU7wAVST67UZI/2clyXYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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