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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f7647ba8392f71d3d4e36299710f07f221fb3198600661d8437d43e1852f29a' 
  AND token = 'DlDiln0B9yLKfoiaj2irZLNELGKFk8Fa+HnJhFg3CMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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