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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7296824fa4787272fe9dc68a46214d99f7cc390fdfbb2f32c94dda145b79a25e' 
  AND token = 'i4JsbH8yi2qYTeZiENR4aVG+qekuF31Yr46yc3dNapI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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