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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb7955b9b7d3d2f6bae6d0c9ed13d59d2c60f72fae4c4264dbac9e531f3f6ef8' 
  AND token = '2NVu0mlZJZyKvOSkB4zOHFxSaQalUrVTqNC2wBIPte4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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