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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fba7ba9190343dff2fa5dbdda86263c9a35d4dbf9b7326849a6b7b7942f1a805' 
  AND token = 'c/RjCl1hlpn5SbxsR2no27l7yQ7Sj6K3D3pL0+GqqXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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